that "the lives of all people everywhere are of equal fundamental worth when viewed impartially". They then wonder why "the affluent do so little, and demand so little of their governments, while remaining confident that they are morally decent people who generally fulfil their duties to others?" The reviewers agree with Singer, and say they see a conflict between the behaviours of the affluent and the claims of the affluent to being morally decent people. The reviewers also discuss other practical ways to fight poverty. Philosopher Thomas Nagel says that nobody, not even Singer, will act according to Singer's ideal of giving up all possessions that are less valuable than a human life. Nagel says that our unwillingness to sacrifice may not be entirely an issue of motivation: Nagel says that we can make moral objections, although he calls Singer's principle "plausible". In June 2010, Bill and Melinda Gates and Warren Buffett launched the "Billionaires' Pledge" (The Giving Pledge)—calling on all billionaires to give at least half their wealth to philanthropic causes—in an interview with Charlie Rose. In the interview, Melinda Gates mentioned Singer's The Life You Can Save, referring to it as suggesting the importance of knowing that other members of one's "reference set"—one's peers—are also helping others. The book inspired Cari Tuna and her fiancé Dustin Moskovitz, one of the co-founders of Facebook, to start their own philanthropic foundation, Good Ventures, which is focused on high impact philanthropy and is working in close partnership with a charity evaluator called GiveWell. Impact After the release of the book, Peter Singer founded the organization The Life You Can Save. The organization is devoted to providing information about and promoting participation in activities that reduce poverty and economic inequality. The organization also encourages people to publicly pledge a percentage of their income to highly effective aid organizations and gives recommendations for about a dozen of such charities. In 2014 the number of people who had pledged publicly reached 17,000. In addition, the US non-profit One for the World was established in 2014 to offer a simple way to take Singer's suggested 1% pledge. As of mid-2019, they have donated nearly $400k to effective causes and are active in schools in the US, Canada and Australia. They also have over $1m of annualised pledges already committed. Singer's thought-experiment about the drowning child featured in the book formed the basis of choral music